Whether you're just a little more cautious today because of various Friday the 13th superstitions, historically, the day hasn't always turned out to be, well, normal.

Here's our wrapup of the top five worst Friday the 13ths.

In 1939, the Black Friday brush fires began in Australia. The fires ended January 20. They left 71 people dead, 1,000 people injured and 3,000 homeless.

In October 1972, the Andes flight disaster left 16 survivors after two months.

In January 1989, the Friday the 13th virus struck hundreds of IBM computers in Britain.

In 1996, Tupac Shakur died September 13 of gunshot wounds sustained a week earlier.

And in January, the Costa Concordia cruise ship ran aground on the island of Giglio, Italy, killing at least 30.

Today, as part of our coverage, CNN Radio's new Soundwaves blog is also featuring a podcast about tempting fate on this date, as well as a little history of how the superstition came to be. It also questions the kind of experiences people have had on this rare day.

The Belief Blog also has a breakdown, written by Connecticut College professor Stuart Vyse, exploring why exactly we fear Friday the 13th and how superstitions manifest themselves.

It's also National French Fry Day, so do with that what you will.

Let us know how your Friday the 13th goes, and what superstitions you have in the comments below.